Pile-driver



(No Model.)

G. H. GAVANAGH.

w v W N. PETERS. Phola-Lxlhognphu. Willlington. n. c

UNTTE STATES GEORGE H. OAVANAGH, OF BOSTON, MASSACHUSETTS.

FILE-DRIVER.

SPECIFICATION forming part of Letters Patent No. 299,344, dated May 27, 1884.

- Application filed January 28, 188-1. (No model.)

To all whom it may concern:

Be it known that I, GEORGE H. CAVANAGH, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Pile-Drivers, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention is an improvement on United States Letters Patent No. 205,244., granted to me June 25, 1878, to which reference may be had.

It sometimes happens that a contractor is called to further drive piles partially driven and placed in a row, or to drive fiat or planklike piles, called sheet-piles. To do such work, and especially to drive the sheet-piling, the planks should stand in a row edge to edge, and the said planks are customarily tongued and grooved to make water tight work. My patent apparatus is not adapted for this work, because the hammer slides in ways arranged within the frame. In my experiments to do sheet-piling I discovered, by arranging upon a suitable upright frame-w ork a longitudinally-movable track or tracks and mounting the hammer upon the same so that the operative lower end of the hammer should project outwardly beyond the upright part of the framework. that the latter could be brought close to one side of the row of piles to be driven, and the hammer be made to project or extend outward over the said piles.

This track is made verticallyadjustable, so

that it may follow the piles as they are driven to any distance below the frame-work which receives or supports the track or the guides in which the track is held.

Figure 1, in front elevation, represents a sufficient portion of a pile-driver or of a framework to illustrate my present invention; and Fig. 2, a section thereof on the dotted line 00 m, Fig. 1.

The frame-work is herein shown as composed of a sill, A, and uprights B B,united by means of suitable cross-beams, B B B B; but I desire it to be understood that I do not limit my invention to the particular shape of the frame- I work, as that may be of any usual construction, and may be made to rest upon land or to form part of a snow.

The hammer O is grooved at its rear side to embrace a track, Done or moreplaced in and guided by guides or chairs D, attached to the cross-beams. This track at its upper end is provided with a suitable eye, which is engaged by a hook, a, secured to a tackleblock, c and by means of rope (6, extended over the said block and a second block, a, the track may be lowered more or less rapidly in the guides or chairs, to follow down the tops or ends of the piles or plank being driven, even after the said ends have been driven below the sill. The hammer C is operated as usual by a rope, a, controlled by a steam engine or Windlass. The chairs or guides for the track are shown as set directly upon the cross'beams of the frame; but, if de sired, they may be furred out or set upon blocksor planks attached to the outer sides of the said cross-pieces. thus enabling the said track to be projected, if desired, quite a distance outward beyond the upright part of the frame and its supports. \Vhen furring out the guides, the sheaves f r would also be furred out. When but one track is used, I may apply to the cross-beams pieces of plank, as at h h, to steady the movement of the hammer and wearing the track unnecessarily.

I claim In an apparatus for driving piles or plank, a framework, track guides or chairs on the outer side of said frame, a vertically-adjustable track placed in said guides or chairs, and

position, combined with a hammer arranged to slide upon said track, substantially as de scribed. v

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' GEO. H. GAVANAGH. \Vitnesses:

G. V. GREGORY, B. J. NoYEs.

and prevent it from twisting and straining means to move and retain said track in proper 

